nouveau_drm.c:undefined reference to `remove_conflicting_framebuffers'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   29b4817d4018df78086157ea3a55c1d9424a7cfc
commit: c0f0c177b5a9aa6d3791aa497a64a20a297ebc6f drm/udl: make fbdev support really optional
date:   3 weeks ago
config: x86_64-randconfig-s3-08081603 (attached as .config)
compiler: gcc-6 (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        git checkout c0f0c177b5a9aa6d3791aa497a64a20a297ebc6f
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   drivers/built-in.o: In function `i915_driver_load':
   (.text+0x22aec1): undefined reference to `remove_conflicting_framebuffers'
   drivers/built-in.o: In function `nouveau_drm_probe':
>> nouveau_drm.c:(.text+0x2f8c11): undefined reference to `remove_conflicting_framebuffers'

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